its been a number of years now since i did a bunch of research but here is what
i remember...
there can be a huge difference as you start to add camber to a profile, done correctly the low pressure region moves forward as the high pressure region moves further off the trailing edge of the blade, this increases power.
the problem iirc is a couple of things
- cambered blades are hard to carve, concave surfaces are harder to carve than convex surfaces using common methods.
- cambered blades can be rather peaky, in that they really come into their own at a rather narrow tsr, and fall off rather rapidly on either side of that limit.
without some sort of power point converter which uses feedback to keep the blades running at a speed which keeps them within their peak range.
so far it appears most folks have perfected the more common profiles and found them to work over a fairly broad range without resorting to more complicated electronics.
although i really like seeing more folks working toward mppt for windgens, i suspect
in the near future those converters will be worked out and rather common place, much like the early progression went from either no dump load controller or very crude controllers to what is now some very good ones.
soon as someone perfects a 1 or 2 kwatt buck converter, getting control and feedback over it will be fairly simple with a microcontroller,, once that is accomplished i would expect folks starting to work with more advanced profiles.
in my opinion an advanced highly cambered profile likely can attain 50% more power than a simple profile, perhaps more than a crudely carved clark Y profile.
my opinion only, yours and other may very well vary
bob g